Abstract
Electrochemical and electrochromic properties of a series of cathodically coloring copolyimides containing a perylene diimide moiety are reported. Well-defined redox responses were obtained in solutions containing large cation electrolytes that can interact well with the reduced intermediates of perylene diimide. Reversible switch between red, blue, and violet colors corresponded well to the three redox statesneutral, radical anion, and dianion formsof perylene diimide. The fluorescence intensity of these polyimides gradually decreased from the neutral state to the final reduced state.
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